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main.py

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+from flask import Flask, render_template, request, redirect, url_for
+import sqlite3
+import datetime
+import os
+import subprocess
+
+app = Flask(__name__)
+
+
+# Function to create a new database and table if they don't exist
+def initialize_database():
+    conn = sqlite3.connect('todo.db')
+    c = conn.cursor()
+    c.execute('''CREATE TABLE IF NOT EXISTS tasks
+             (id INTEGER PRIMARY KEY AUTOINCREMENT,
+             task TEXT NOT NULL,
+             due_date TEXT,
+             completed INTEGER DEFAULT 0)''')
+    conn.commit()
+    conn.close()
+
+
+# Function to add a new task to the database
+def add_task(task, due_date=None):
+    conn = sqlite3.connect('todo.db')
+    c = conn.cursor()
+    if due_date is None:
+        due_date = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+    c.execute("INSERT INTO tasks (task, due_date) VALUES (?, ?)", (task, due_date))
+    conn.commit()
+    conn.close()
+
+
+# Function to delete a task from the database
+def delete_task(task_id):
+    conn = sqlite3.connect('todo.db')
+    c = conn.cursor()
+    c.execute("DELETE FROM tasks WHERE id=?", (task_id,))
+    conn.commit()
+    conn.close()
+
+
+# Function to view  tasks in the database
+def view_tasks():
+    conn = sqlite3.connect('todo.db')
+    c = conn.cursor()
+    c.execute("SELECT * FROM tasks WHERE completed=0")
+    tasks = c.fetchall()
+    conn.close()
+    return tasks
+
+
+def view_tasks_complited():
+    conn = sqlite3.connect('todo.db')
+    c = conn.cursor()
+    c.execute("SELECT * FROM tasks WHERE completed=1")
+    tasks = c.fetchall()
+    conn.close()
+    return tasks
+
+
+# Function to update a task's details (task or due date)
+def update_task(task_id, task=None, due_date=None):
+    conn = sqlite3.connect('todo.db')
+    c = conn.cursor()
+    if task:
+        c.execute("UPDATE tasks SET task=? WHERE id=?", (task, task_id))
+    if due_date:
+        if due_date.lower() == 'now':
+            due_date = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        c.execute("UPDATE tasks SET due_date=? WHERE id=?", (due_date, task_id))
+    conn.commit()
+    conn.close()
+
+
+# Function to mark a task as completed
+def complete_task(task_id):
+    conn = sqlite3.connect('todo.db')
+    c = conn.cursor()
+    c.execute("UPDATE tasks SET completed=? WHERE id=?", (1, task_id))
+    conn.commit()
+    conn.close()
+
+
+# Initialize the database
+initialize_database()
+
+
+# Route to display tasks
+@app.route('/')
+def index():
+    tasks = view_tasks()
+    completed_tasks = view_tasks_complited()
+    return render_template('index.html', tasks=tasks, completed_tasks=completed_tasks)
+
+
+# Route to add new task
+@app.route('/add', methods=['POST'])
+def add():
+    task = request.form['task']
+    due_date = request.form['due_date']
+    add_task(task, due_date)
+    return redirect(url_for('index'))
+
+
+# Route to update task
+@app.route('/update/<int:task_id>', methods=['POST'])
+def update(task_id):
+    task = request.form['task']
+    due_date = request.form['due_date']
+
+    update_task(task_id, task, due_date, time_left)
+    return redirect(url_for('index'))
+
+
+# Route to delete task
+@app.route('/delete/<int:task_id>', methods=['POST'])
+def delete(task_id):
+    delete_task(task_id)
+    return redirect(url_for('index'))
+
+
+# Route to mark task as completed
+@app.route('/complete/<int:task_id>', methods=['POST'])
+def complete(task_id):
+    complete_task(task_id)
+    print(view_tasks())
+    return redirect(url_for('index'))
+
+
+if __name__ == '__main__':
+    app.run(debug=True)
+
+
+

requirements.txt

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+Flask==2.0.2
+sqlite3

run.bat

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+@echo off
+start  http://127.0.0.1:5000
+REM 
+pip install -r requirements.txt
+
+REM 
+python main.py
+
+REM 
+pause

run.sh

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+pip install -r requirements.txt
+python main.py
+xdg-open http://127.0.0.1:5000

time.hs

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+import Data.Time
+import Data.Time.Format
+import Data.Time.Clock
+import System.Environment (getArgs)
+import Control.Monad (unless)
+
+main :: IO ()
+main = do
+    args <- getArgs
+
+    unless (length args == 2) $ putStrLn "Usage: runhaskell time.hs <time1> <time2>" >> return ()
+    
+    let [arg1, arg2] = args
+        format = "%Y-%m-%dT%H:%M"
+        parseTimeOrError' = parseTimeM True defaultTimeLocale format :: String -> Maybe UTCTime
+    
+    case (parseTimeOrError' arg1, parseTimeOrError' arg2) of
+        (Just time1, Just time2) -> do
+            let diff = diffUTCTime time2 time1
+            putStrLn $ show diff